HPV vaccine (Cervarix): What you need to know. Centers for Disease Control and Prevention website. Available at:
http://www.cdc.gov/vaccines/hcp/vis/vis-statements/hpv-cervarix.html. Updated June 18, 2013. Accessed November 12, 2015.

HPV vaccine (Gardasil): What you need to know. Centers for Disease Control and Prevention website. Available at:
http://www.cdc.gov/vaccines/hcp/vis/vis-statements/hpv-gardasil.html.
Updated June 18, 2013. Accessed November 12, 2015.